Design and Preliminary Testing of a Prototype for Evaluating Lower Leg Trajectory Error as an Optimization Metric for Prosthetic Feet
Design and Preliminary Testing of a Prototype for Evaluating Lower Leg Trajectory Error as an Optimization Metric for Prosthetic Feet
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用于评估小腿轨迹误差作为假足优化指标的原型的设计和初步测试
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Winter
中科院分区：
文献类型：
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作者：
Kathryn M. Olesnavage;A. Winter
这项工作介绍了一个假脚原型的设计和初步测试，旨在评估一个新的被动假足设计目标--小腿轨迹误差(LLTE)。到目前为止，关于LLTE的所有工作都纯粹是理论上的。下一步是进行广泛的临床测试。优化并建立了一个由恒定转动刚度的踝关节和跖关节组成的初始原型，但在2公斤重时，它被证明太重，不能用于临床测试。为了减轻fiNAL原型的重量，提出了一种新的概念足部结构，并对其进行了优化。该足由恒定刚度为6.1N·m/deg的旋转踝关节、从踝膝轴延伸0.08m的刚性结构和弯曲刚度为5.4N·m2的悬臂梁前足组成。样机是用机械加工的Delrin制造的刚性结构，三个平行的拉伸弹簧从销关节脚踝沿等半径凸轮偏移，加工尼龙作为梁的前脚。在初步测试中，确定尽管努力将重量和尺寸降至最低，但由于拉伸弹簧仍然太重太大，不能用于广泛的临床测试。未来的工作将集中在进一步减轻重量，在开始临床研究之前，用fl外部元件替换线性拉伸弹簧。
This work presents the design and preliminary testing of a prosthetic foot prototype intended for evaluating a novel design objective for passive prosthetic feet, the Lower Leg Trajectory Error (LLTE). Thus far, all work regarding LLTE has been purely theoretical. The next step is to perform extensive clinical testing. An initial prototype consisting of rotational ankle and metatarsal joints with constant rotational stiffness was optimized and built, but at 2 kg it proved too heavy to use in clinical testing. A new conceptual foot architecture intended to reduce the weight of the final prototype is presented and optimized for LLTE. This foot consists of a rotational ankle joint with constant stiffness of 6.1 N · m/deg, a rigid structure extending 0.08 m from the ankle-knee axis, and a cantilever beam forefoot with bending stiffness 5.4 N · m 2 . A prototype was built using machined delrin for the rigid structure, three parallel extension springs offset along a constant radius cam from a pin joint ankle, and machined nylon as the beam forefoot. In preliminary testing, it was determined that, despite efforts to minimize weight and size, this particular design was still too heavy and bulky as a result of the extension springs to be used in extensive clinical testing. Future work will focus on reducing the weight further by replacing linear extension springs with flexural elements before commencing with the clinical study.